User = Struct.new(:admin, :moderator) do
  def admin? = admin
  def moderator? = moderator
end

user = User.new(admin: false, moderator: true)

status =
  if user.admin?
    "admin"
  elsif user.moderator?
    "moderator"
  else
    "user"
  end
# => "moderator"
      

class User {
  constructor({ admin, moderator }) {
    this.admin = admin;
    this.moderator = moderator;
  }

  isAdmin() {
    return this.admin;
  }

  isModerator() {
    return this.moderator;
  }
}

const user = new User({ admin: false, moderator: true });

let status;
if (user.isAdmin()) {
  status = "admin";
} else if (user.isModerator()) {
  status = "moderator";
} else {
  status = "user";
}
// => "moderator"
      

User = Class.new
Admin = Class.new(User)
Moderator = Class.new(User)

user = Admin.new

status =
  case user
  when Admin
    "admin"
  when Moderator
    "moderator"
  else
    "user"
  end
# => "admin"
      

class User {}
class Admin extends User {}
class Moderator extends User {}

const user = new Admin();

let status;
if (user instanceof Admin) {
  status = "admin";
} else if (user instanceof Moderator) {
  status = "moderator";
} else {
  status = "user";
}
// => "admin"